<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1"/>

    <link href="/css/bootstrap.min.css" rel="stylesheet"/>
    <style>
        .col-md-4{}
        .col-md-6{}
        .row{

        }
        .col-md-4{

        }
        .gutter{
            margin-right: -10px;
            margin-left: -10px;
            padding: 10px;
            background-color:#eee;

        }

    </style>
</head>
<body>
    <div class="container-fluid">
        <div class="row">
            <div class="col-md-4"><div class="gutter">.col-md-4</div></div>
            <div class="col-md-4"><div class="gutter">.col-md-4</div></div>
            <div class="col-md-4"><div class="gutter">.col-md-4</div></div>
        </div>
        <div class="row" style="margin-top:30px">
            <div class="col-md-6">.col-md-6</div>
            <div class="col-md-6">.col-md-6</div>
        </div>

    </div>
</body>
</html>